If I watch many different video files in a continuous (non-stop) manner, totem eventually causes a system freeze. At first, it says there is a videosink error; just press OK and close totem, the problem fixes itself... for a little while. Eventually the entire system just seems to freeze, but it's only the GUI.

I enter tty using <Ctrl>+<Alt>+F1 and kill totem using kill -9 $(pgrep totem). After returning to the desktop using <Ctrl>+<Alt>+F7, totem is killed and the problem is gone. I can now repeat the process indefinitely. I have not tested this situation using anything but MKV files and you need a batch of about 60 files and plenty of free time to repeat this.

It's not a problem for regular use (as I barely watch non-stop videos / tv shows). It's annoying is all and I just want to know if there is a solution.

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You probably have to check dmesg output and Xorg.log for errors as it sounds like it is problem with drivers/X server.
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dilettantDec 30 '11 at 16:20